and Performance of MJ Pulper
Paper Machine Designing Section, Mitsubishi Heavy Industries, Ltd.
The society switches over resources sustainable circulation system
so as to recycle the all things come to an end in the view of environmental
improvement. In recent year, the amount of functional papers has
been increased rapidly by means of the progress of productivity,
the revolution of transportation system and the investigation for
convenience. And these functional papers have hard wet strength
In the try to be re-pulped with functional papers for utilization
into recycling papers, these materials were disposed to land reclamation
or to burn it to ashes in view point of consideration for cost
balances by reason of the conventional pulpers were required with
much more electric energy and extra machinery and equipments. But
the degree of reutilization for recycled fibers was increased gradually
in worldwide. And then it becomes to make problems of the lack
of stock-supply. S0 the needs of re-utilizing waste functional
papers were took up sharply in the field.
In the background for the above, we developed with MJ pulper of
the new concepts. The MJ pulper realized the energy saving and
also one unit of MJ pulper has been operated favorably in the field.
In the below, we will explain the construction and the effect of
saving energy of MJ pulper.
Solutions for Papermaking Problems with New Spraying Chemical
― Presentation of “Spanol N-3250” ―
Paper Chemicals Lab., Nichiyu Solution Inc.
Deposit problems in papermaking tend to increase more and more
in recent years. So we have developed a new nonionic chemical,
“Spanol N-3250” which is sprayed directly to wire, felt, and
roll parts in wet-end sections of papermaking. Functional mechanisms
of “Spanol N-3250” are “Detackification” of deposits and “Passivation”
of wire, felt, roll, etc. “Spanol N-3250” has excellent effects
not only on deposit control but also on drainage improvements
in wet-end sections, whether deposit problems are found or not.
We propose new solutions with “Spanol N-3250” to provide improved
performance in papermaking.
Result from the BTF Introduction
−Promising Items by Improvement in Quality with BTF System−
Mechanical Designer Paper Machinery, Kawanoe Zoki., Ltd.
We have issued the result of the BTF retrofit to the existing headbox,
improvement in not only CD-dry weight profile but also fiber orientation,
at every occasion.
This paper will discuss the actual improvement and benefit result
from the quality improvement with BTF dilution profiling.
The main concept of the BTF retrofit dilution system is to replace
the Tapered Header feed to the existing headbox and install a BTF
Central Distributor with Automatic Dilution Profiling. Because stock
distribution by conventional Tapered Header is the principal source
of problems related to the control of basis weight, for all modern
headboxes. And the solution to this problem is the BTF central distributor.
Regardless of the flow conditions through distributor, with its
symmetrical design, creates a uniform pressure loss from one edge
of the headbox
to the other, and the stock passed through flexible hoses, each of
identical length, and is delivered to the headbox tube bank.
Proactive Maintenance - Downtime Reduction
FAG Kugelfischer AG
Unpredicted bearing damages often result in paper machine standstills
and production losses, which cause huge cost loss in paper industry.
Recently Online monitoring systems are focussed as a countermeasure
to reduce the unexpected standstills due to the bearing damages.
But this will not be the permanent solution for the bearing damage.
To reduce the bearing damages it is much more important to focus
on the application and to adopt appropriate solutions for the
Development of Ultrasonic Testing System of Rubber Roll for the
Nikko Inspection Service Co., Ltd.
Kokusakukikou Co., Ltd.
Nippon Paper Unitech Co., Ltd.
The rubber-covered roll used for paper machine becomes multilayer
structure where the polyurethane rubber or FRP etc. is used.
The peel might be caused between layers of this roll by long-term
use. The thickness of paper becomes not uniform by the occurrence
of the peel, and it is serious problem in this production process.
The conventional inspection method to detect the peel was only
hammering test, tactile impression or visual inspection. The
peel of an initial stage is difficult to detect because only
a distinctive peel can be detected by these inspection methods.
Therefore, the ultrasonic examination technique to detect the
peel of initial stage in quantitatively was developed.
In this development, it paid attention to the phenomenon of
the ultrasonic reflection wave on the boundary layer of the rubber.
The reversal phenomenon of the phase by the peel was observed,
and a device to extract its phase was developed. Now, this developed
system is used to inspect actual rubber-covered roll, and quantitative
evaluation is obtained.
This paper reports the principle of inspection, a content of
system development, and an actual inspection result.
A Study of SB-latex Concentration near the Surface of Coated Paper
by Integration Ball Type Ultraviolet Spectrophotometer
Polymer Research Laboratories, JSR Corporation
Material Characterization and Analysis Laboratory, JSR Corporation
JSR AMERICA INC.
Since the quantitative analysis method using chromatoscanner (Shimazu
Chromatoscanner CS-930) was proposed by Fujiwara et al., it has been
widely used to obtain the information on styrene-butadiene latex
(SB-latex) concentration near the surface of coated paper. chromatoscanner
is a reflection-absorption spectrophotometer and it can provide ultraviolet
absorbance of the styrene units in SB-latex. The absorbance has been
used as a measure of SB-latex concentration.
However, chromatoscanner couldn’t measure the whole of the reflection,
so that there may be a few ambiguities in the interpretation of the
experimental results. In this report, we studied on the technique
for evaluating the SB-latex concentration near the surface of coated
paper with using the integration ball type UV spectrophotometer that
was able to measure the absolute value of reflectivity.
Then the relation between the average density of the latex that
existed in the area of depth of which everything given from the surface
the coating layer and the absolute value of reflectivity was examined
by solving the Kubelka-Munk equation, which described the light-absorption
in optically inhomogeneous systems. As a result, we found that it
was derived to be able to decide the average density of the latex
that existed in the area from the surface of the coating layer to
depth about 1-1.5μm level.
Retention System Using the Anionic Micro Particle Polymer
Kenji Sakai and Kazuyuki Hirata
Shonan Research Center, HYMO Corporation
The Improved Dual Polymer System (HYMO Twins system) of retention
aid for the high speed paper machines consists of addition of
the water soluble cationic polymer and anionic polymer those
obtained by the micro precipitation polymerization in the salt
containing aqueous media.
The anionic aqueous polymer dispersion (FA230) for the system
shows excellent performance for the ash retention and the homogeneous
web formation because of it’s micro particle behavior of the
We discovered the improvement of the micro particle characteristic
of the anionic polymer result in small and strong floc suitable
for web formation at high shear conditions.
The floc formation behavior, the ash retention and the drainage
performance of the extended FA-series polymer were analyzed by
the Flocky-tester, the Britt Dynamic Jar Tester (DDJ) and the
Dynamic Drainage Analyzer (DDA).
Compozil System Application for Liner Machine
Yoshikazu Sonehara and Nobuaki Imaizumi
Nissan-Eka Chemicals Co., Ltd.
Compozil system is a multifunctional wet-end chemical system developed
by Eka Chemicals AB in Sweden, and this system has been well accepted
for all of the paper including liner and board.
In this paper, the application of Compozil system into a Japanese
liner machine is discussed.
The liner machine has the problems of lower retention and drainage,
higher dosage of the chemicals, and spot on the product due to
the neutralized pH caused by more waste paper as the feedstock.
To dissolve these problems the introduction of Compozil system
was studied. During the test run and the usual operation after
the introduction of Compozil system since March 2003, following
improvements have been proved.
1）Better retention and drainage, less dosage of the chemicals,
and the reduction of the spot were accomplished
2）The increase of 2-3% average machine speed was realized
3）Around 1% increase of the finishing yield under stable operation
4）Around 6% increase of averaged production rate per day
5）Significant saving of electric power consumption
6）Around 2.3% up of relative machine operation efficiency
7）Less frequency of the paper break (no paper break operation
for 7 months was scored )
Keywords: Compozil system, retention, dewatering, liner, neutral
papermaking, spot, machine speed, productivity, paper break,
colloidal silica, cationic polymer,
Paper Caliper Increaser “PT Product Line”
Naruhiko Sone, Teruyuki Matsushima and Masaaki Kawamura
SEIKO PMC CORPORATION, R&D Division, Ichihara Laboratory
Recently, low-density or light-weight paper has been required, especially
for book paper and printing and writing paper grades. Books with
the use of the light-weight paper with low paper density have been
published and have made the best-seller lists. Various grades of
light-weight paper with low density have been recently on the market
in Japan. Thus, demand of light-weight paper with low density will
be increased from various aspects including environmental issues
such as resource saving.
Addition of paper chemicals to pulp slurries at the wet end is one
of the methods to increase paper caliper. We have developed this
type of paper chemicals called “paper caliper increaser, PT series,”
which increase paper caliper, sizing degree, and moreover allow less
We summarize here the characteristics of paper caliper increasers
available in Japan and make a working hypothesis for the mechanism
of increase in paper caliper from the results for evaluation of various
caliper increaser samples with different properties. Some examples
of application are also given.
New cross Direction Control Technology in QCS
P&W Solution Dept., Industrial Automation Systems Business
Yokogawa Electric Corporation
In this paper, we introduce two newly developed cross direction
control technologies in QCS. One is finite response CLP CD control
that uses finite settling response method in sampled-data control
theory. In a machine where it was applied, the convergence time
after sheet pass was decreased by 50 % compared with the conventional
sampled PI control. The other is CD adaptive control.
In consistency control for basis weight profile, the actuator intervals
become narrower than those in slice bolt control and that makes
the allowance of accuracy of position correspondence more severe.
And wide width machines have more possibility of variation of position
correspondence. So the automatic identification of position correspondence
during CD control has been strongly demanded.
We have succeeded to develop this challenging technology named
as CD adaptive control and applied it to an actual machine. It can
substitute the conventional identification method by step response
test and the continuous running of this CD adaptive control makes
the 2 sigma of basis weight profile smaller than operation when
this control is not running.
Introduction of RCS Roll Wrapping and Handling System
Itochu Sanki Corporation
RCS has been dedicated to develop their know-how, initiatives,
idea, and sprit for innovations for decades. The demands for roll
wrapping and handling are becoming hard and diversified, not only
for the protection against humidity, tear up, grease, but for low
cost optical attractiveness, ecological benefit. This paper introduces
the latest technologies of RCS to meet the all expectations.RCS
has been dedicated to develop their know-how, initiatives, idea,
and sprit for innovations for decades. The demands for roll wrapping
and handling are becoming hard and diversified, not only for the
protection against humidity, tear up, grease, but for low cost
optical attractiveness, ecological benefit. This paper introduces
the latest technologies of RCS to meet the all expectations.
Layer Separation of Kenaf Bast Fiber and the Influence of Each
Layer to the Kenaf Bast Paper Strength
Yu Wang, Wiwin Suwinarti, Shinji Fujiwara and Kazuhiko Sameshima
Faculty of Agriculture, School of Forest Science, Kochi University
School of Life Science and Technology, Tongji University, Shanghai
Kenaf bast fiber is composed of primary(P) and secondary(S)
phloem fibers. The primary phloem is single layer but the secondary
phloem comprised of multiple layers which decreased the number
according to the height of the stem section. The higher the section,
the lower the number of secondary phloem layers.
Layer separation was made at the middle part of a stem and the fiber length,
the weight, the viscosity( copper ethylene diamine, CED) were measured. The average
fiber length as length weighted fiber length was 2.65−3.00mm (P) and 2.25-2.60mm(S).
The primary phloem fiber is obviously longer than the secondary phloem fiber.
The weight ratio (P/S) was 0.073. CED viscosity was 76-96cp (P) and 121-142cp
(S). The primary phloem had lower viscosity.
The five sample paper sheets[ A) only secondary phloem, B)no separation, C)and
D)increased P/S ratio, and E) only primary phloem] pulps were prepared from the
lower part of a stem and subjected to paper strength tests. It was shown that
with the increase of the primary phloem pulp ratio give inferior strength properties
than the only secondary phloem pulp. It might mainly be explained by the lower
CED viscosity of primary phloem. The production possibility of higher quality
kenaf bast paper by using the higher stem part which has more primary phloem
than the lower stem part should be examined more in detail.
Keywords: kenaf, bast fiber, viscosity, fiber length, paper strength, phloem
Simulation for Compressive Behavior of Cartons
Hironobu Hirano, Takao Kobayashi and Isao Kodaka
Pulp and Paper Research Lab., Oji Paper Co., Ltd.
In order to optimize structural design of cartons such as corrugated
boxes, it is necessary to understand their behavior when they
are subjected to compressive loads. Since cartons have a complicated
structure that is composed of multiple panels combined with each
other, and the compression of cartons gives rise to a phenomenon
involving plastic material behavior and buckling, it is difficult
to analyze the behavior from the theoretical point of view. Therefore,
numerical simulations using the nonlinear finite element method
were performed to predict the compressive behavior of cartons.
Cartons were modeled as simplified configurations, tubes, which
consist of four side panels. The material was assumed to be elastic-plastic
with the properties of the paperboard. The carton model was divided
equally into 3-D quadrilateral shell elements. The bottom edge
was fully constrained as the boundary condition, and the compressive
displacements in the vertical direction were applied for all
nodes on the top edge as the loading condition. Considering material
and geometrical nonlinearities, finite element analysis was carried
out by the Newton-Raphson iterative method. All computations
were performed using the commercial finite element program NISA
Compressive behavior of a carton was able to be simulated as
follows. As the carton was compressed, the load applied on the
top edge increased, and four side panels of the carton buckled
into some sinusoidal waves. However, the load never fell because
the vertical edges remained straight in spite of the buckling
of the side panels. Eventually, buckling of a vertical edge induced
the collapse of the carton, when the load reached its maximum
point, and then decreased rapidly. The load value of this point
corresponds to the compressive strength. This computation was
able to be performed until four side panels folded up regularly
towards inside of the carton. Simulation results showed that
load-displacement relationships and deformation behavior were
influenced significantly by material properties and structural
Keywords: Carton, Compression, Plasticity, Buckling, Finite element